Usain Bolt: from Beijing to London in pictures

Usain Bolt won the 100m and 200m double at the Beijing Games in 2008, setting world records in both events in the process. Since then he's had world championship glory, disappointment in Daegu and seen his dominance of the sprints threatened by his compatriot Yohan Blake.
But as he reveals in our exclusive interview, he's ready to prove himself the best in the world once more at London 2012